ras rat rca rcc rcd rce rcf rcl rcn rco rcr rcs rct rda rdc rdd rde rdf rdl rdn rdo rdr rds rdt re- rea rec red ree ref rel ren reo rer res ret rfa rfc rfd rfe rff rfl rfn rfo rfr rfs rft rla rlc rld rle rlf rll rln rlo rlr rls rlt rna rnc rnd rnn rno rnr rns rnt roa roc rod roe rof rol ron roo ror ros rot rra rrc rrd rrf rrl rrn rrr rrs rrt rsa rsc rsd rse rsf rsl rsn rso rsr rss rst rta rtc rtd rte rtf rtl rtn rto rtr rts rtt saa sac sad sae saf sal san sao sar sas sat sca scc scd sce scf scl scn sco scr scs sct sda sdc sdd sde sdf sdl sdn sdo sdr sds sdt se- sea sec sed see sef sel sen seo ser ses set sfa sfc sfd sfe sff sfl sfn sfo sfr sfs sft sla slc sld sle slf sll sln slo slr sls slt sna snc snd sne snf snl snn sno snr sns snt soa soc sod soe sof sol son soo sor sos sot sr- sra src srd sre srf srl srn sro srr srs srt ss- ssa ssc ssd sse ssf ssl ssn sso ssr sss sst sta stc std ste stf stl stn sto str sts stt taa tac tad tae taf tal tan tao tar tas tat tca tcc tcd tce tcf tcl tcn tco tcr tcs tct tda tdc tdd tde tdf tdl tdn tdo tdr tds tdt te- tea tec ted tee tef tel ten teo ter tes tet tfa tfc tfd tfe tff tfl tfn tfo tfr tfs tft tla tlc tld tle tlf tll tln tlo tlr tls tlt tna tnc tnd tne tnf tnl tnn tno tnr tns tnt to- toa toc tod toe tof tol ton too tor tos tot tra trc trd tre trf trl trn tro trr trs trt tsa tsc tsd tse tsf tsl tsn tso tsr tss tst tta ttc ttd tte ttf ttl ttn tto ttr tts ttt